时效对铝镁硅合金线材力学性能和导电率的影响  

Effect of aging condition on mechanical properties and electrical conductivity of Al-Mg-Si alloy wire

作　　者：章益 侯嘉鹏 袁衢龙 张振军 陈玲 张哲峰[2] ZHANG Yi;HOU Jia-peng;YUAN Qu-long;ZHANG Zhen-jun;CHEN Ling;ZHANG Zhe-feng(National Quality Inspection&Test Center of Electrical Equipment Safety Performance,Zhejiang Huadian Equipment Testing Institute Co.,Ltd.,Hangzhou 311121,China;Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]浙江华电器材检测研究院有限公司,国家电力器材产品安全性能质量检验检测中心,浙江杭州311121 [2]中国科学院金属研究所,师昌绪先进材料创新中心,辽宁沈阳110016

出　　处：《轻合金加工技术》2022年第9期41-46,共6页Light Alloy Fabrication Technology

基　　金：国家电网浙江省电力公司项目(5211HD210003)。

摘　　要：通过拉伸试验、电阻测试试验、疲劳试验和透射电子显微镜观察,对比研究了不同时效状态下铝镁硅合金线材强度、导电率和疲劳性能的演化规律及机制。结果表明:与欠时效态和过时效态相比,峰时效态的铝镁硅合金线材具有最高的抗拉强度、最大的伸长率和最优的疲劳性能。均匀弥散分布的球状析出相导致的析出强化和位错绕过析出相的方式是峰时效态铝镁硅合金线材兼具强度、塑性和疲劳性能优异的根本原因。随着时效时间的延长,铝镁硅合金线材导电率不断增大的主要原因是固溶原子的析出和析出相的长大。The mechanisms behind the evolutions of the strength,electrical conductivity and fatigue properties of the Al-Mg-Si alloy wires under different aging conditions were investigated by the tensile test,resistance test,fatigue test and transmission electron microscope observations.The results show that the peak-aged Al-Mg-Si alloy wires have the highest tensile strength,elongation and fatigue properties compared with the under-aged and over-aged Al-Mg-Si alloy wires.The precipitation strengthening and the improvement of slip uniformity caused by uniformly dispersed spherical precipitates are the key reasons for the peak-aged Al-Mg-Si alloy wires with high-strength,high-elongation and excellent fatigue properties.Besides,the electrical conductivity of the Al-Mg-Si alloy wire increases with the aging time,which is mainly due to the precipitation of solid solution atoms and the growth of precipitated phases.

关 键 词：铝镁硅合金线材 时效 强度 导电率 疲劳性能 

分 类 号：TG166.3[金属学及工艺—热处理]